Gas extinguishing system

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A gas extinguishing system is a fire extinguishing system that extinguishes a fire by means of a gaseous extinguishing agent either through oxygen displacement (reduction of the oxygen content), physical (heat extraction) or chemical effects ( chain termination reaction ).

With gaseous extinguishing agents only room protection, extinguishing in enclosed protected areas (rooms), is possible. The exception is facility protection (property protection) with carbon dioxide, e.g. B. for printing machines.

Differentiation of gas extinguishing systems based on the extinguishing agent used:

In the case of carbon dioxide and inert gas extinguishing systems, people have to leave the extinguishing area before the extinguishing gas flows in, in order not to be harmed by the reduced oxygen content.

When using carbon dioxide extinguishing systems, the following should also be considered:

  • The extinguishing agent is toxic and basically life-threatening in an extinguishing concentration.
  • Carbon dioxide is much heavier than air, sinks and therefore collects in pits and basements.
  • As with all liquefied extinguishing gases, the sudden cooling of the carbon dioxide expanding at the nozzles causes the moisture in the room air to condense into a mist, which can make it difficult to escape from the extinguishing area.

Chemical extinguishing systems work by extracting heat from the flame. The oxygen displacement, which takes place only to a very small extent, is a non-extinguishing effect and is negligible with regard to personal safety.

It is always necessary to leave an extinguishing area, as fire gases are generally hazardous to health.

In conjunction with gas extinguishing systems, alarm devices must always be provided for persons present in the extinguishing area, which warn them before the extinguishing system is triggered.

Due to their possible dangers, gas extinguishing systems are only used in the event of fire risks that cannot be controlled by other fire extinguishing systems or where other fire extinguishing systems would cause disproportionately high consequential damage. The use of extinguishing water or foam can, for. B. in archives , libraries , switch rooms, technical rooms or data centers cause major or irreparable damage.

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